The two main places I can think of are CR turbos or Turbotechnics, regards the movement it seems there is a bit of a grey area here, I was always told "some" sideways play is fine but in/out is where you have to worry. That's the rule I've always went by but some people worry unnecessarily at any sign of play, your money your car at the end of the day if you're not comfortable with it then no harm in getting it rebuilt.